Fix importwallet nTimeFirstKey
[Qt] rescan progress
Have pull-tester run the listtransactions.py regression test

This should show how to run a python-based regression test
successfully in the pull-tester environment.
Merge pull request #3928

3927836 [Qt] rescan progress (Cozz Lovan)
Merge pull request #3998

cb4bdd1 Have pull-tester run the listtransactions.py regression test (Gavin Andresen)
Merge pull request #3929

4c35366 Fix importwallet nTimeFirstKey (Cozz Lovan)